AEGON NV has agreed to acquire Transamerica Corp. for $9.7 billion, of which 70% will be in stock and 30% in cash. AEGON also will assume about $1.1 billion of Transamericas holding company debt. AEGON USA, Baltimore, and Transamerica, San Francisco, will merge immediately following the deals closing, expected this summer. Together, they will manage $6.5 billion in 401(k) assets and $9.15 billion in GICs and annuities. The AEGON Group is headquartered in The Hague, Netherlands, and has more than $147 billion in assets. Transamerica is based in San Francisco and has about $58.5 billion in assets.